Made from 100% recycled polyester, and 100% recycled plastic for the aglet, Oboz’s proprietary Flat Shoelaces are offered in five sizes to best fit your shoe needs. The aglet in all sizes is 3mm in diameter. These flat laces will instantly give your shoes a fresh, classic look. The main benefit of using Flat Shoelaces is ease of tying and ability to stay tied. But to ensure they stay tied during the length of your adventure, consider tying a double knot.